Worth noting when she first got sick she had diarreah and also a few of the poops in this photo-yellow and smooth 1 1/2 inch in size.
.Oh, That’s the missing piece of the puzzle right there.
Right you are Miss Stacey!
@pepperellchick that is not poop, that is a Lash Egg or Salpingitis which is inflammation of the oviduct.
With her stance, I would say she has more that need to be passed or she may have some in her abdomen as well. Lash Eggs (coagulated pus) can block the oviducts.
You can try an antibiotic like Baytril to see if she improves.
https://the-chicken-chick.com/salpingitis-lash-eggs-in-backyard/
https://the-chicken-chick.com/causes-of-lash-eggs-salpingitis-by/